EP0903762B1 - Mehrteiliges Gehäuse für Schutzschalter - Google Patents

Mehrteiliges Gehäuse für Schutzschalter Download PDF

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Publication number
EP0903762B1
EP0903762B1 EP98115804A EP98115804A EP0903762B1 EP 0903762 B1 EP0903762 B1 EP 0903762B1 EP 98115804 A EP98115804 A EP 98115804A EP 98115804 A EP98115804 A EP 98115804A EP 0903762 B1 EP0903762 B1 EP 0903762B1
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EP
European Patent Office
Prior art keywords
base
subbase
bottom wall
contact arm
circuit breaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98115804A
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English (en)
French (fr)
Other versions
EP0903762A3 (de
EP0903762A2 (de
Inventor
Bernard Dimarco
David A. Leone
Bruce D. Guiney
Neal Reeves
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Siemens Energy and Automation Inc
Original Assignee
Siemens Energy and Automation Inc
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Filing date
Publication date
Application filed by Siemens Energy and Automation Inc filed Critical Siemens Energy and Automation Inc
Publication of EP0903762A2 publication Critical patent/EP0903762A2/de
Publication of EP0903762A3 publication Critical patent/EP0903762A3/de
Application granted granted Critical
Publication of EP0903762B1 publication Critical patent/EP0903762B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/025—Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts
    • H01H71/0257—Strength considerations

Definitions

  • the present invention relates generally to the housing for a circuit breakers and in particular to a housing which includes a base having improved structural characteristics and a subbase which allows easy assembly of the breaker.
  • a conventional circuit breaker comprises several components including source and load side terminals, a line strap, a movable load contact arm, a latch mechanism which is used to manually open an close the breaker and an electromagnetic tripping device which operates in response to an overcurrent flowing through the load contact arm and line strap to trip the latch and open the breaker.
  • all of these components except for the latch are duplicated three times.
  • each of the component parts of the circuit breaker is typically mounted in the breaker housing with tight tolerances.
  • the principal current carrying components, the load contact arm and the line strap it is desirable for the principal current carrying components, the load contact arm and the line strap, to be parallel and in close proximity along at least a portion of their length and yet insulated from each other.
  • This construction enables these breaker components to generate the strong magnetic repulsive forces that are used to "blow-open" the connection between the load and line contacts during a large overcurrent condition.
  • this structure is achieved by applying insulation directly over each line strap and then assembling the load contact arm directly over the insulation.
  • the document EP 0 490 332 discloses a circuit breake housing according to the preamble of claim 1 and 7.
  • circuit breaker The assembly requirements of a circuit breaker contribute directly to its cost. Accordingly, it is desirable to design a circuit breaker to simplify its assembly as much as possible.
  • a relatively open housing may allow at least some components to be assembled before they are inserted into the housing.
  • components close to the bottom of the housing, for example, the line straps may be inserted more easily if the circuit breaker housing has open space through which these components may be guided to their destinations.
  • the insertion of the line contact arms or line straps into a circuit breaker housing may be particularly difficult because these components often have shapes which bend back upon themselves.
  • the line contact arms are shaped so that the line and load terminals may be on opposite sides of the breaker but also, for blow-open operation, so that at least a portion of the line contact arm may be parallel to a corresponding portion of the load contact arm.
  • the current flow through the parallel portion of the load contact arm should be in the opposite direction to the current flow through the corresponding parallel portion of the line strap.
  • These line straps are typically in the bottom of the breaker housing and include a line terminal which is accessible from outside the circuit breaker housing. Thus, in many existing breakers, the line straps are dropped into the bottom of the housing and then maneuvered to push the line terminal through a slot in the side of the circuit breaker.
  • circuit breakers there is often a tradeoff between ease of assembly and structural integrity. If a circuit breaker housing is designed with too much open space, it may not be strong enough structurally to withstand the normal forces to which the circuit breaker is subject to during installation and use, especially forces generated when the breaker is subject to heavy short-circuit currents. During a heavy short-circuit condition, electrical arcing which occurs when the line contact is separated from the load contact may cause an explosive rise in pressure inside the breaker housing.
  • the present invention is embodied in a circuit breaker housing having multiple sections including a base and a subbase.
  • the base includes a bottom wall having an opening through which a movable load contact arm may project to make contact with a line contact arm.
  • the wall provides insulation between parallel portions of the load contact arm and the line contact arm and provides a tie between side walls of the housing to enhance the structural integrity of the housing.
  • the subbase includes a pocket which holds the line contact arm and is attached to the base such that a line contact at the end of the line contact arm is directly beneath the opening in the bottom wall of the base.
  • the base includes vertical ribs, adjacent to the opening in the bottom wall connecting and strengthening the bottom wall and the side walls.
  • the subbase has at least two pockets which hold respective line contact arms and has a partial wall, between the line contact arms, which includes a feature that mates with a corresponding feature on a respective partial wall in the base to form an insulating wall between the two line contact arms.
  • FIG 1 is an isometric drawing of a circuit breaker 100 which includes an embodiment of the present invention.
  • the breaker 100 includes a cover 110 which is attached over a base 112 and a subbase (not shown in Figure 1) which is inserted into the bottom of the base 112.
  • the base 112 of the breaker has two side walls 113 and 111 on opposite sides of the breaker 100.
  • FIG. 2 is a sectional view of the breaker 100 taken along the rightmost pole, lines 2-2 of Figure.1.
  • This drawing shows the cover 110, base 112 and subbase 114.
  • Assembled onto the subbase 114 is a fixed line strap 118 which includes a line contact 119.
  • Attached to the base is a movable load contact arm 116 which includes a load contact 117.
  • the base also includes a bottom wall 120 which separates the load contact arm 116 from the line strap 118.
  • the base may be made, for example, from glass filled polyester such that the bottom wall 120 forms an electrically insulating barrier between the load contact arm 116 and the line strap 118.
  • This insulating barrier formed by the bottom wall 120 replaces separate insulators which are needed in existing breakers to separate the load contact arm from the line strap and thus, simplifies the assembly of the breaker 100 by reducing the number of parts and making the breaker easier to assemble.
  • the bottom wall 120 of the base extends into and out of the page as shown in Figure 2 between the two side walls 111 and 113 of the breaker to form a structural tie which joins the two sides of the circuit breaker. This tie strengthens the base as a rigid member extending across the base at a level approximately one-third of the height of the base.
  • the subbase 114 is inserted within the bottom of the circuit breaker 100.
  • the side walls of the base 112 extend around the subbase 114.
  • the horizontal tie formed by the bottom wall 120 of the base combined with the bottom wall of the breaker 100, formed by the subbase 114, and the top wall of the breaker, formed by the upper wall of the cover 110, provide three rigid side-to-side supports for the assembled circuit breaker 100. Because one of these ties, the bottom wall 120 of the base 112, is a part of the molded base, pressure exerted against the side walls of the base is unlikely to deform the base or cause cracks to appear between the base and the cover when the breaker is subject to high-current short circuit conditions.
  • the line terminal 122 is also shown in Figure 2.
  • the breaker is assembled by placing the line straps 118 on top of the subbase 114 and then inserting the subbase into a pocket on the bottom of the base 112.
  • the line terminals 122 there are no openings in the molded base for the line terminals 122 which need to be cleared before the molded part may be used and there is no need to thread the line terminals 122 through openings in the base 112.
  • This configuration of the subbase 114 and base 112 also simplifies the assembly of the circuit breaker 100.
  • Figure 3 is an isometric top-view of the base 112 which is useful for describing its structural features.
  • the base shown in Figure 3 is for a three-phase breaker. It includes three similar chambers, one for each phase. Each chamber includes an arc chamber pocket 310 and a subchamber 314 which holds the breaker mechanism and load conductors (neither of which is shown in Figure 3).
  • the floor of the subchamber 314 is the bottom wall 120 of the base 112. Separating the arc chamber pocket 310 from the mechanical and load conductor area are vertical ribs 312 which are integrally molded with the circuit breaker base 112.
  • the arc chamber pocket 310 of the assembled breaker includes a series of arc grids (not shown) along its side walls which are designed to quickly dissipate electrical arcs that may form when the breaker contacts 117 and 119 (shown in Figure 2) are opened. These arcs may form, for example, when a short circuit condition causes the breaker to "blow open" the load and line contacts. In this instance, the current flowing through the breaker generates an electrical arc as the contacts are separated. This arc rapidly heats the air within the breaker resulting in an explosive rise in pressure. In addition, the arc ionizes the air in the arc chamber allowing current to flow through the breaker, albeit at reduced levels, even after the line and load contacts have been separated. This residual current flow heats the air within the breaker, causing a further rise in the internal pressure.
  • the grids in the arc chamber 310 ensure that the energy released in the arc dissipates completely in the arc chamber.
  • the ribs 312 which separate the arc chamber 310 from the mechanical and load conductor area 314, serve to strengthen the breaker by providing vertical supports.
  • ribs 312 as well as the tying brace formed by the bottom wall 120 of the base 112 allow the breaker to withstand relatively large internal forces such as 1) the rapid pressure increases resulting from arcing in the arc chamber, 2) the magnetic blow-open repulsive force and 3) repetitive smaller forces, such as the forces to which the breaker is subject due to repeated switching of the breaker between the open and closed positions.
  • the supports allow the breaker base 112 to withstand externally generated forces, such as may result in shipping or in handling before the breakers are installed.
  • Figure 4 is an isometric drawing showing the bottom of the base 112. As shown in Figure 4, the bottom wall 120 of the base extends across the floor of the mechanical and load conductor areas 314 (shown in Figure 3).
  • the base 112 also includes three openings,'410 through which the line strap contacts 119 and load blade contacts 117 may be engaged by the breaker mechanism. These openings 410 are located at the bottom of the arc chamber pockets 310.
  • the bottom of the base 112 also includes ribs 420 which have grooves 422 on their outer edges into which, ribs in the subbase are inserted to form insulating walls between the three line straps 118.
  • One of the ribs 420 includes a gap 424 through which a protruding member on the subbase (described below with reference to Figure 5) is inserted.
  • the base 112 shown in Figure 4 also includes a shelf 426 along the inside of the side walls 111 and 113 and at the back end of the bottom wall 120 of the base.
  • This shelf 426 makes contact with the subbase 114 when it is inserted into the base.
  • the shelf in the base follows the exterior contours of the subbase so that the subbase 114 fits snugly into the base 112.
  • the shelf provides mechanical support for the combination of the base 112 and subbase 114. Because the subbase 114 is inserted into the base 112, the walls of the base form an insulating barrier which encloses the line straps 118.
  • Mounting holes 430 may be used to receive screws which secure the subbase to the base.
  • Figure 5 is an exploded view of the base 112, line straps 118 and subbase 114.
  • the subbase includes ribs 512 which fit into the grooves 422 on the ends of the corresponding ribs 420 (shown in Figure 4) of the base 412.
  • the subbase includes a projection 524 which mates with the opening 424 (shown in Figure 4) in the base 112.
  • the subbase includes a total of four screw holes which may be used to secure the subbase to the base. Two of these screw holes 514 are shown in Figure 5. The remaining screw holes are proximate to the line terminals 122 of the line straps and are not visible in the isometric drawing of the subbase shown in Figure 5. These screws attach the subbase to the base via the mounting holes 430 shown in Figure 4.
  • the subbase 114 is attached to the base 112 by screws
  • the base and subbase may be attached by screws, an adhesive, such as epoxy, by a combination of screws and adhesive or by other methods.
  • adhesive may be used to attach the subbase 114 to the base 112 to attach the outer edge of the subbase to the shelf 426 and grooves 422 which couple the outer rim of the subbase 114 to the base 112.
  • the adhesive may be applied to the shelf 426 and all of the grooves 422 in order to attach the subbase securely to the base.
  • the combined use of screws and adhesives may provide significant advantages where the breaker may interrupt relatively large currents and, thus, may be subject to large changes in internal pressure.
  • Figure 6 is an exploded side-plan view corresponding to the exploded isometric vies of the breaker 100 shown in Figure 5.
  • Figure 6 includes a sectional view of the base 112 taken along the lines 5-5 shown in Figure 1. This side plan view illustrates strengthening members 312 and 120 which have been added as a result of the two-piece base design.
  • Figure 6 also shows the areas of the base into which the line strap 118 is inserted and the projection 618 on the subbase 114 which mates with the wall 620 of the base 112 to form a channel through which the line terminal is accessible from the opening 622 in the base 112 of the circuit breaker 100.
  • Figure 7 is an isometric drawing of the assembled breaker 100 with the base cut away along the lines 5-5 of Figure 1.
  • This Figure shows the line straps 118 inserted into the line strap pockets 510 of the subbase 114. It also shows the ribs 512 which form the sides of the line strap pockets 510 and which engage the grooves 422 in the ribs 420 that project down from the bottom of the base 112.
  • Figure 8 is a side plan view corresponding to the isometric drawing shown in Figure 7. This drawing illustrates the assembled base 112 and subbase 114 before the load contact arms and mechanical structure are inserted into the base.
  • Figure 8 shows the structural relationship between the bottom wall 120 of the base and the vertical rib 312.
  • the rib 312 is located near the opening 420 in the base 112 to reinforce the bottom wall 120 proximate to the opening 420.
  • the right angles formed by the junction of the bottom wall 120 and the vertical ribs 312 significantly strengthen the base 100, allowing it to withstand greater internal and external stresses than a base having a more open one-piece design.

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Claims (13)

  1. Leistungsschaltergehäuse, welches umfasst:
    ein Gestell (112) mit einer ersten und einer zweiten Seitenwand (111, 113) und einer Bodenwand (120), die sich zwischen der ersten und der zweiten Seitenwand (111, 113) erstreckt und eine Öffnung (410) aufweist, durch welche ein Leitungskontaktarm (118) ragt, um mit einem beweglichen Lastkontaktarm (116) in Kontakt zu kommen, wobei die Bodenwand (120) eine konstruktive Abstützung für das Gestell (112) bildet und eine elektrisch isolierende Barriere zwischen entsprechenden Teilen des Lastkontaktarms (116) und des Leitungskontaktarms (118) darstellt; dadurch gekennzeichnet, dass das Leistungsschaltergehäuse umfasst:
    ein mit dem Gestell (112) mechanisch gekoppeltes Untergestell (114) mit einer Aussparung (510), in welche der Leitungskontaktarm (118) eingesetzt ist, derart, dass, wenn das Untergestell (114) mit dem Gestell (112) gekoppelt ist, ein Teil des Leitungskontaktarms (118), an welchem ein Leitungskontakt (119) befestigt werden kann, durch die Öffnung (410) in der Bodenwand (120) des Gestells (112) ragt, um mit dem beweglichen Lastkontaktarm (116) in Kontakt zu kommen.
  2. Leistungsschaltergehäuse nach Anspruch 1, wobei das Gestell (112) ferner eine vertikale Rippe (312) umfasst, die sich von der Seitenwand (111, 113) des Gestells (112) aus nach innen erstreckt und neben der Öffnung (410) in der Bodenwand (120) an der Bodenwand (120) des Gestells (112) befestigt ist, wobei die vertikale Rippe (312) die Seitenwand (111, 113) an der Bodenwand (120) befestigt und die Seitenwand (111, 113) des Gestells (112) und die Bodenwand (120) des Gestells (112) in der Nähe der Öffnung (410) in der Bodenwand (120) konstruktiv versteift.
  3. Leistungsschaltergehäuse nach Anspruch 1, wobei:
    die Bodenwand (120) des Gestells (112) eine Innenfläche, welche sich neben dem Lastkontaktarm (116) befindet, und eine Außenfläche, welche sich neben dem Leitungskontaktarm (118) befindet, aufweist und das Gestell eine sich von der Außenfläche der Bodenwand (120) aus erstreckende Verbindungsrippe (420) umfasst, wobei die Verbindungsrippe (420) ein Verbindungsmerkmal aufweist; und
    das Untergestell (114) eine Innenfläche aufweist, welche die Leitungskontaktarm-Aussparung (510) enthält, und das Untergestell (114) eine sich von der Innenfläche der Bodenwand aus erstreckende weitere Verbindungsrippe (512) umfasst, wobei die Rippe (512) einen Rand aufweist, welcher ein weiteres Verbindungsmerkmal umfasst,
    wobei sich das weitere Verbindungsmerkmal der weiteren Verbindungsrippe (512) mit dem Verbindungsmerkmal der Verbindungsrippe (420) vereinigt, um eine isolierende Wand neben dem Leitungskontaktarm (118) zu bilden.
  4. Leistungsschaltergehäuse nach Anspruch 3, wobei das Untergestell (114) am Gestell (112) durch Auftragen eines Klebstoffes auf das Verbindungsmerkmal und das weitere Verbindungsmerkmal vor dem Befestigen des Untergestells (114) am Gestell (112) befestigt ist.
  5. Leistungsschaltergehäuse nach Anspruch 1, wobei das Untergestell (114) am Gestell (112) mit Schrauben befestigt ist.
  6. Leistungsschaltergehäuse nach Anspruch 1, wobei das Untergestell (114) am Gestell (112) mit einem Klebstoff befestigt ist.
  7. Leistungsschaltergehäuse, welches umfasst:
    ein Gestell (112), das mit einem Untergestell (114) mechanisch gekoppelt ist, mit: einer ersten und einer zweiten Seitenwand (111, 113); einer Bodenwand (120), die sich zwischen der ersten und der zweiten Seitenwand (111, 113) erstreckt, wobei die die Bodenwand (120) eine Öffnung (410) aufweist, durch welche ein Leitungskontaktarm (118) ragt, um mit einem beweglichen Lastkontaktarm (116) in Kontakt zu kommen, wobei die Bodenwand (120) eine konstruktive Abstützung für das Gestell (112) bildet und eine elektrisch isolierende Barriere zwischen entsprechenden Teilen des Lastkontaktarms (116) und des Leitungskontaktarms (118) darstellt; dadurch gekennzeichnet, dass eine vertikale Rippe (312) sich von der Seitenwand (111, 113) des Gestells (112) aus erstreckt und neben der Öffnung (410) in der Bodenwand (120) an der Bodenwand (120) des Gestells (112) befestigt ist, wobei die vertikale Rippe (312) die Seitenwand (111, 113) an der Bodenwand (120) befestigt und die Seitenwand (111, 113) des Gestells (112) und die Bodenwand (120) des Gestells (112) in der Nähe der Öffnung (410) in der Bodenwand (120) konstruktiv versteift;
    das Untergestell (114) einer Aussparung (510) enthält, in welche der Leitungskontaktarm (118) eingesetzt ist.
  8. Leistungsschaltergehäuse nach Anspruch 7, wobei:
    die Bodenwand (120) des Gestells (112) eine Innenfläche, welche sich neben dem Lastkontaktarm (116) befindet, und eine Außenfläche, welche sich neben dem Leitungskontaktarm (118) befindet, aufweist und das Gestell eine sich von der Außenfläche der Bodenwand (120) aus erstreckende erste Verbindungsrippe (420) umfasst, wobei die erste Verbindungsrippe (420) ein erstes Verbindungsmerkmal aufweist; und
    das Untergestell (114) eine Innenfläche aufweist, welche die Leitungskontaktarm-Aussparung (510) enthält, und das Untergestell (114) eine sich von der Innenfläche der Bodenwand (120) aus erstreckende zweite Verbindungsrippe (512) umfasst, wobei die zweite Verbindungsrippe (512) einen Rand aufweist, welcher ein zweites Verbindungsmerkmal umfasst, wobei sich das zweite Verbindungsmerkmal der zweiten Verbindungsrippe (512) mit dem ersten Verbindungsmerkmal der ersten Verbindungsrippe (420) vereinigt, um eine isolierende Wand neben dem Leitungskontaktarm (118) zu bilden.
  9. Leistungsschaltergehäuse nach Anspruch 8, wobei das Untergestell (114) am Gestell (112) durch Auftragen eines Klebstoffes auf das erste oder das zweite Verbindungsmerkmal oder beide vor dem Befestigen des Untergestells (114) am Gestell (112) befestigt ist.
  10. Leistungsschaltergehäuse nach Anspruch 9, wobei das Untergestell (114) ferner am Gestell (112) mit Schrauben befestigt ist.
  11. Leistungsschaltergehäuse nach Anspruch 7, wobei das Untergestell (114) einer Aussparung (510) enthält, in welche der Leitungskontaktarm (118) eingesetzt ist, wobei das Untergestell (114) eine Innenfläche aufweist, welche die Leitungskontaktarm-Aussparung (510) enthält, und das'Untergestell (114) eine sich von der Innenfläche der Bodenwand (120) aus erstreckende erste Verbindungsrippe (512) umfasst, wobei die erste Verbindungsrippe (512) einen Rand aufweist, welcher ein erstes Verbindungsmerkmal umfasst; und die Bodenwand (120) des Gestells (112) eine Innenfläche, welche sich neben dem Lastkontaktarm (116) befindet, und eine Außenfläche, welche sich neben dem Leitungskontaktarm (118) befindet, aufweist und das Gestell (112) eine sich von der Außenfläche der Bodenwand (120) aus erstreckende zweite Verbindungsrippe (420) umfasst, wobei die zweite Verbindungsrippe (420) ein zweites Verbindungsmerkmal aufweist, derart, dass das erste und das zweite Verbindungsmerkmal sich vereinigen, um eine isolierende Wand neben dem Leitungskontaktarm (118) zu bilden.
  12. Leistungsschaltergehäuse nach Anspruch 11, wobei das Untergestell (114) am Gestell (112) mit Schrauben befestigt ist.
  13. Leistungsschaltergehäuse nach Anspruch 12, wobei das Untergestell (114) am Gestell (112) mit einem Klebstoff befestigt ist.
EP98115804A 1997-09-23 1998-08-21 Mehrteiliges Gehäuse für Schutzschalter Expired - Lifetime EP0903762B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/935,754 US6005207A (en) 1997-09-23 1997-09-23 Multi-part circuit breaker housing
US935754 1997-09-23

Publications (3)

Publication Number Publication Date
EP0903762A2 EP0903762A2 (de) 1999-03-24
EP0903762A3 EP0903762A3 (de) 1999-12-08
EP0903762B1 true EP0903762B1 (de) 2004-03-24

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EP98115804A Expired - Lifetime EP0903762B1 (de) 1997-09-23 1998-08-21 Mehrteiliges Gehäuse für Schutzschalter

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US (1) US6005207A (de)
EP (1) EP0903762B1 (de)
DE (1) DE69822580T2 (de)

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JP2894052B2 (ja) * 1990-12-11 1999-05-24 株式会社日立製作所 回路遮断器
US5278531A (en) * 1992-08-06 1994-01-11 Eaton Corporation Molded case circuit breaker having housing elements
FR2696276B1 (fr) * 1992-09-29 1994-12-02 Merlin Gerin Disjoncteur à boîtier moulé à contacts auxiliaires.

Also Published As

Publication number Publication date
EP0903762A3 (de) 1999-12-08
DE69822580D1 (de) 2004-04-29
EP0903762A2 (de) 1999-03-24
DE69822580T2 (de) 2005-02-03
US6005207A (en) 1999-12-21

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